The intra-pipe dock shelters are used to perform repair work on the pipeline. The main difficulties while using the dock shelter lie in the control of its movement through the pipeline. The developing device and the principle of maintenance are shown in the illustration 1. The receivers are provided with GPS and GSM module and/or Ethernet, while passing the dock shelter the receivers register the signal and send the data of it's location to the server. With the help of the client program, technical staff gets the operative data, and decides to slow down or completely stop the dock shelter, operating the magnitude of the intra-pipe pressure. As soon as the dock is registered by the receiver in the area of a planned repair work it will be stopped at a predetermined position by controlling the pump units and valves. The positioning error will depend on the preceding moving speed of the dock shelter, the data transfer time from the receiver to the server and from the server to the client, and the quality of technical operations management.

Приведена методика расчета экологической спелости леса. Экологическая
спелость леса является интегральным показателем, обобщающим все спелости леса экологической направленности. За экологическую спелость леса
принято максимальное накопление диоксида углерода разными древесными
породами в определенном возрасте. Показано, что модальные древостои Беларуси поступают в рубку приблизительно в возрасте экологической спелости. Нормальные древостои имеют возраст экологической спелости выше,
чем возрасты рубки в эксплуатационных лесах.

A method for calculating the ecological maturity of the forest is given. The
ecological maturity of the forest is an integral advantage that generalizes all the
maturity of the forest of ecological orientation. The non-ecological ripeness of the
forest has led to an increase in the stock of tree species in case of danger. It is
shown that the modal stands of Belarus enter the felling at approximately the age
and ecological maturity. Normal forest stands have an age of ecological maturity
higher than felling ages in forest exploitation.